Lithospheric Compression in the Central Indian Ocean in the Light of New, Deep-Penetration MCS Data

根据新的深穿透 MCS 数据研究中印度洋岩石圈挤压

• 批准号: 9204168
• 负责人: Jeffrey Weissel
• 金额: $ 42.19万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-01 至 1995-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9204168&HistoricalAwards=false
• 关键词: Lithospheric; Compression; Central; Indian; Ocean

An along axis profile of 3-D magnetic inversions for the Mid- Atlantic Ridge 31 to 35 degrees south, show low magnetization at the mid-sediments and high magnetizations at the sigment tips for three adjacent spreading segments. This project will measure rock magnetic properties to determine if the calculated axial magnetization low at the mid-segment, and the sigment tip highs, results from thickened crust with weakly magnetized sources, average crustal thickness and magnetic strength, or normal magnetization but thinned crust. With the rock magnetic data and the finer scale 3-D inversions, the questions of to what extent the hypothesized mantle plume depress magnetization amplitudes, and are slow spreading centers near discontinuities strongly magnetized because of fractionation processes, will be addressed.

大西洋中脊南纬 31 度至 35 度的 3D 磁力反演的沿轴剖面显示，三个相邻扩张段的沉积物中部磁化强度较低，而线段尖端磁化强度较高。 该项目将测量岩石磁特性，以确定计算出的中段轴向磁化强度低和段尖端高是由弱磁化源的增厚地壳、平均地壳厚度和磁场强度造成的，还是由正常磁化但地壳变薄造成的。 利用岩石磁性数据和更精细尺度的 3-D 反演，将解决以下问题：假设的地幔柱在多大程度上抑制磁化幅度，并且是由于分馏过程而强磁化的不连续性附近的缓慢扩散中心。